.net 6或5调用webservice自定义头。（金碟里的SessionId的传递）

1、先引用服务。
2、在生成的服务的Reference.cs里创建一个class，继承自 System.ServiceModel.Channels.MessageHeader

public class SessionIdHeader : System.ServiceModel.Channels.MessageHeader
{
public SessionIdHeader(string sessionId)
{
SesssionId = sessionId;
}
public string SesssionId { get; set; }

    protected override void OnWriteStartHeader(System.Xml.XmlDictionaryWriter writer, System.ServiceModel.Channels.MessageVersion messageVersion)
    {
        writer.WriteStartElement("ns1", Name, Namespace);
        writer.WriteXmlnsAttribute("ns1", Namespace);
    }

    protected override void OnWriteHeaderContents(System.Xml.XmlDictionaryWriter writer, System.ServiceModel.Channels.MessageVersion messageVersion)
    {
        writer.WriteValue(SesssionId);
    }

    public override string Name
    {
        get { return "SessionId"; }
    }

    public override string Namespace
    {
        get { return "http://login.webservice.bos.kingdee.com"; }
    }
}
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2、调用
//登录服务的调用
var client = new EASLoginService.EASLoginProxyClient(EASLoginService.EASLoginProxyClient.EndpointConfiguration.EASLogin);
var loginResult = await client.loginAsync(“user”, “user123”, “eas”, “xwf220318”, “12”, 2);

//其它服务调用，并将登录服务里的SessionId带过去。
var client2 = new WSFullOrgUnitFacadeService.WSFullOrgUnitFacadeSrvProxyClient(WSFullOrgUnitFacadeService.WSFullOrgUnitFacadeSrvProxyClient.EndpointConfiguration.WSFullOrgUnitFacade);
using (new OperationContextScope(client2.InnerChannel))
{
MessageHeaders messageHeadersElement = OperationContext.Current.OutgoingMessageHeaders;
messageHeadersElement.Add(new WSFullOrgUnitFacadeService.SessionIdHeader(loginResult.loginReturn.sessionId));

            var result = await client2.queryOrgUnitAsync("2010-01-01");
        }
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